code: def visit_add_strings(self, op: AddStrings) -> dict:
      return {"values": list(op.values)}
  
imports: from neptune.common.exceptions import InternalClientError
  from neptune.internal.operation import AddStrings, AssignArtifact, AssignBool, AssignDatetime, AssignFloat, AssignInt, AssignString, ClearArtifact, ClearFloatLog, ClearImageLog, ClearStringLog, ClearStringSet, ConfigFloatSeries, CopyAttribute, DeleteAttribute, DeleteFiles, LogFloats, LogImages, LogStrings, Operation, RemoveStrings, TrackFilesToArtifact, UploadFile, UploadFileContent, UploadFileSet
  from neptune.internal.operation_visitor import OperationVisitor, Ret
label_desc: Use image node_id 18 for calling the OperationApiObjectConverter obj's underlying member method code with example usage: obj.visit_add_strings(op) and returns: dict